Initial Inspection and Diagnostic Overview

Electric Shift Operations

If the system operates improperly, or will not operate at all, a problem
could exist in a control switch, the electronic control module, the speed
sensor, the electric shift motor, the electro-magnetic clutch assembly,
neutral safety switch or the interconnecting wiring.

Use the following guidelines and test procedures to assist in locating the
cause of a problem.


Circuit Protection

The battery feed circuit, through a circuit breaker, provides memory
capability for the electronic control module.

Ignition RUN feed circuit, through a fuse, provide power for the switches
and the electric shift motor.

The circuit provides power for nighttime illumination of the switches
located in the instrument panel.



Control Module Self-Test

The electronic control module has a diagnostic capability of its own
circuitry. The self-test procedure is as follows:

1. Remove the five-wire connector and the eight-wire connector from the bottom of the electronic control module.

2. Turn the ignition switch to the RUN position.

3. Activate the self-test switch located on the module and note the result:

^ A flashing indicator lamp (approximately one flash per second) indicates that the control module is functioning properly.

^ A steady indicator lamp indicates that the control module is inoperative and must be replaced.








Control Module Circuits

There are three wiring harnesses connected to the electronic control
module: the eight-wire pigtail harness connector; the five-wire harness
connector; and the eight-wire harness connector.

To check the integrity of these circuits, disconnect the harnesses from the Electronic Control Module and perform the following checks.